We want to run 2 AMD64 servers with Red Hat Linux with a total
of 10 TB data space.

Can we only mount 1 2 TB gfs filesystem? Or can there be several
gfs "filesystems", each with whatever that version of Linux supports
as the max filesystem size? (16TB under 2.6)

From the docs:
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2.4 Fibre Channel Storage Devices

Table 2-3 shows requirements for Fibre Channel devices that are to
be connected to a GFS cluster.

Size 2 TB maximum, for total of all storage connected to a GFS cluster.
Linux 2.4 kernels do not support devices larger than 2 TB;
therefore the total size of storage available to GFS cannot
exceed 2 TB.
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